GB1573122A - Saw blade - Google Patents
Saw blade Download PDFInfo
- Publication number
- GB1573122A GB1573122A GB6690/77A GB669077A GB1573122A GB 1573122 A GB1573122 A GB 1573122A GB 6690/77 A GB6690/77 A GB 6690/77A GB 669077 A GB669077 A GB 669077A GB 1573122 A GB1573122 A GB 1573122A
- Authority
- GB
- United Kingdom
- Prior art keywords
- blade
- saw
- teeth
- edge
- thickness
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- A—HUMAN NECESSITIES
- A22—BUTCHERING; MEAT TREATMENT; PROCESSING POULTRY OR FISH
- A22B—SLAUGHTERING
- A22B5/00—Accessories for use during or after slaughtering
- A22B5/20—Splitting instruments
- A22B5/203—Meat or bone saws for splitting carcasses
- A22B5/205—Manual saws
-
- A—HUMAN NECESSITIES
- A22—BUTCHERING; MEAT TREATMENT; PROCESSING POULTRY OR FISH
- A22B—SLAUGHTERING
- A22B5/00—Accessories for use during or after slaughtering
- A22B5/20—Splitting instruments
- A22B5/203—Meat or bone saws for splitting carcasses
- A22B5/207—Reciprocating, percussion or hydraulic cutting means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
- B23D51/00—Sawing machines or sawing devices working with straight blades, characterised only by constructional features of particular parts; Carrying or attaching means for tools, covered by this subclass, which are connected to a carrier at both ends
- B23D51/16—Sawing machines or sawing devices working with straight blades, characterised only by constructional features of particular parts; Carrying or attaching means for tools, covered by this subclass, which are connected to a carrier at both ends of drives or feed mechanisms for straight tools, e.g. saw blades, or bows
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
- B23D61/00—Tools for sawing machines or sawing devices; Clamping devices for these tools
- B23D61/12—Straight saw blades; Strap saw blades
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
- B23D61/00—Tools for sawing machines or sawing devices; Clamping devices for these tools
- B23D61/12—Straight saw blades; Strap saw blades
- B23D61/121—Types of set; Variable teeth, e.g. variable in height or gullet depth; Varying pitch; Details of gullet
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Food Science & Technology (AREA)
- Knives (AREA)
- Surgical Instruments (AREA)
- Processing Of Meat And Fish (AREA)
Description
(54) SAW BLADE
(71) We, JARVIS PRODUCTS
CORPORATION, a corporation organised under the laws of the State of Connecticut, United
States of America, of 33 Anderson Road,
Middletown, Connecticut, United States of
America, do hereby declare the invention for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement: The present invention relates to saw-blades.
According to the present invention there is provided a straight saw blade adapted for reciprocation without tension in a carcass splitting saw, comprising a back portion having a back edge and an integral transversely tapering portion integral with the back portion and having a cutting edge parallel to the back edge, the back portion having a substantially uniform thickness, the tapering portion having its greatest thickness at its line of junction with the back portion and being hollow ground with its least thickness along a line spaced from its cutting edge, saw teeth being formed in said cutting edge, each said tooth being adapted to remove a portion of the material being sawn, and the width of the back portion, i.e. the distance from the back edge to the junction, being no greater than half of the distance from the back edge to the base of the teeth.
This blade is expressly designed for use in a heavy-duty hydraulically powered saw for splitting animal carcasses, wherein the saw blade is about 30" long and is driven, from one end, at speeds up to 2200 oscillations per minute.
Reciprocating saw blades have heretofore been made of flat steel and, in order to have enough rigidity to be practical, the thickness had to be substantial (e.g., at least .065" to .070"). When a beef carcass was split by such a saw blade an amount of bone and meat corresponding to the blade thickness was removed and lost. Additionally, a flat blade having only the thickness named was still relatively flexible and flexed or "whipped" substantially in use on the pushing stroke. At high speeds of oscillation this increased greatly the noise level of the operation, raising it beyond the OSHA DBA level rating. Due to metal fatigue the flat blades have a tendency to break, with the danger of serious injury to the operator.
The line of least thickness may be spaced from the base of the teeth by a distance of about one-third of the width of the blade i.e.
the distance from the back edge to the cutting edge; preferably the root portions of the teeth are bevel ground, the tooth working faces being joined by a curved portion.
The invention will now be described with reference to the accompanying drawing wherein:
Figure 1 is a somewhat diagrammatic side elevation of a carcass splitting saw of the type in which the improved saw blade is intended to be used;
Figure 2 is a side elevation of a known saw blade, part of its length being cut away;
Figure 3 is a vertical section on the line III
III of Figure 2.
Figure 4 is a side elevation of one end portion of a form of saw blade according to the invention;
Figure 5 is a vertical section on an enlarged scale, taken on the line V-V of Figure 4; and
Figure 6 is a detail vertical section on the line VI-VI of Figure 4.
Referring to the drawing, and particularly
Figures 1 to 3, the saw blade 10 comprises a straight strip of band saw steel stock having a back portion 11 of uniform thickness, greater than that of blades heretofore in use, and a
tapered portion 12 with teeth 13 cut into the
thin edge of the tapered portion. The blade is
tapered on both sides, i.e., the surface planes of
the tapered portion angled symmetrically with
respect to the median plane of the blade. The
tips of the teeth may suitably have a thickness
which is about half the thickness of the back
portion 11. The teeth are straight, not set
laterally, symmetrical, and filed straight across
so that their edges lie in planes perpendicular to
the plane of the blade. Holes 14 are provided
near each end of the blade for mounting the
blade in the saw, and the lower corners are pre
ferably beveled as shown at 13'.
A form of carcass splitting saw in which the
blade 10 is intended to be used is shown in
Figure 1, by way of example. This saw includes
a hydraulic motor, indicated generally at 15,
driving an eccentric 16 to reciprocate the link
17 and rock the bell crank 18. The free end of
the bell crank is connected at 19 to one end of the blade 10, the other end of the blade being
engaged at 20 with a link 21 housed in the distal
end 22 of the saw. The portion of the blade adjacent to the link 21 is housed and guided in the downwardly extending portions 23 of the saw casing. About half of the length of the blade is fully exposed, at 24, between the respective end portions of the saw. Saw handles, support cable, hose connection and other details of the saw are not shown, being conventional.
Upon actuation of the motor 15, the bell crank is rocked and the saw blade is pushed and pulled along a short, almost straight oscillatory path.
The saw blade 10 is typically about 30" long, as noted above, and is three inches wide, from the back edge to the tooth points. The back portion 11 has a width of which is no greater than half the distance from the back to the base of the teeth (e.g., 114"). The teeth are cut at 60 angles between their edges and are spaced two to the inch. In the tapered portion 12 the thickness of the blade varies from about .05" (+ .005") at the points of the teeth to about
.109" at the line of junction between portions
11 and 12. The blade may suitably be hardened to 4045 R "C".
Field testing of the tapered saw blade described above has shown that it performs the cutting operation effectively, with the advantages referred to, but that the outward taper from the cutting edge upward tends to cause a smearing of removed material, such as fat, across the cut portion of the bone (i.e., the vertebrae).
Some users may consider tills to be obJectlonable, because of discoloration of the bone surfaces, and the expedient shown in Figures 4 to 6 may be resorted to in order to overcome the smearing tendency.
In the. blade 25 of Figures 4 to 6 the back portion 26 has a uniform thickness like the portion 11 in Figures 1 to 3, but the tapered portion 27 is hollow ground, on a long radius 28 (e.g., about six feet) centered at a point 29 above the base of the teeth (e.g., one inch above). This creates a zone 30 adjacent the cutting edge and extending upwardly therefrom, where the blade has a varying reduced thickness, which may be from .002" to .008" (maximun at 31) less than the thickness at the points of the teeth. It has been found that this blade cuts more easily and cleaner than the single tapered blade of Figures 1 to 3, and eliminates the smearing of the bone, while retaining the ability to stand rapid reciprocation (2200
R.P.M.) with a strong rigid back portion and teeth having a cutting thickness of only .05" to .06".
The root portions of the teeth are shown as being modified by bevel grinding (as with a .25' cutter) each side of the blade at its root, as shown at 32, and the tooth working faces may be joined by a curve 33 instead of meeting at a sharp corner.
While a knife blade severs a mass by "disconnecting" its parts along the blade edge and push- ing the parts aside, the teeth of a saw act to remove and discard all the material of the mass in their path. The tapered saw blades described above have a cutting tooth edge which is thinner by about one-third than the cutting tooth edge of the previously used flat blade, so that it removes less material, i.e., wastes less, while requiring less power to cut through a given distance. The thicker back portions 11 or 26 give the blade substantially greater rigidity so that flexing is minimized and the narrowness of the teeth (which move through the material easier than wider teeth would) contributes to the reduction in flexing. The bone and meat through which the blade is designed to cut, separate as the cutting progresses without causing the blade to bind.
WHAT WE CLAIM IS:
1. A straight saw blade adapted for reciprocation without tension in a carcass splitting saw, comprising a back portion having a back edge and an integral transversely tapering portion integral with the back portion and having a cutting edge parallel to the back edge, the back portion having a substantially uniform thickness, the tapering portion having its greatest thickness at its line ofjunction with the back portion and being hollow ground with its least thickness along a line spaced from its cutting edge, saw teeth being formed in said cutting edge, each said tooth being adapted to remove a portion of the material being sawn, and the width of the back portion, i.e. the distance from the back edge to the junction, being no greater than half of the distance from the back edge to the base of the teeth.
2. A saw blade according to claim 1 wherein said line of least thickness is spaced from the base of the teeth by a distance of about onethird of the width of the blade, i.e. the distance from the back edge to the cutting edge.
3. A saw blade according to claim 2 where
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (4)
- **WARNING** start of CLMS field may overlap end of DESC **.tapered portion 12 with teeth 13 cut into the thin edge of the tapered portion. The blade is tapered on both sides, i.e., the surface planes of the tapered portion angled symmetrically with respect to the median plane of the blade. The tips of the teeth may suitably have a thickness which is about half the thickness of the back portion 11. The teeth are straight, not set laterally, symmetrical, and filed straight across so that their edges lie in planes perpendicular to the plane of the blade. Holes 14 are provided near each end of the blade for mounting the blade in the saw, and the lower corners are pre ferably beveled as shown at 13'.A form of carcass splitting saw in which the blade 10 is intended to be used is shown in Figure 1, by way of example. This saw includes a hydraulic motor, indicated generally at 15, driving an eccentric 16 to reciprocate the link17 and rock the bell crank 18. The free end of the bell crank is connected at 19 to one end of the blade 10, the other end of the blade being engaged at 20 with a link 21 housed in the distal end 22 of the saw. The portion of the blade adjacent to the link 21 is housed and guided in the downwardly extending portions 23 of the saw casing. About half of the length of the blade is fully exposed, at 24, between the respective end portions of the saw. Saw handles, support cable, hose connection and other details of the saw are not shown, being conventional.Upon actuation of the motor 15, the bell crank is rocked and the saw blade is pushed and pulled along a short, almost straight oscillatory path.The saw blade 10 is typically about 30" long, as noted above, and is three inches wide, from the back edge to the tooth points. The back portion 11 has a width of which is no greater than half the distance from the back to the base of the teeth (e.g., 114"). The teeth are cut at 60 angles between their edges and are spaced two to the inch. In the tapered portion 12 the thickness of the blade varies from about .05" (+ .005") at the points of the teeth to about .109" at the line of junction between portions11 and 12. The blade may suitably be hardened to 4045 R "C".Field testing of the tapered saw blade described above has shown that it performs the cutting operation effectively, with the advantages referred to, but that the outward taper from the cutting edge upward tends to cause a smearing of removed material, such as fat, across the cut portion of the bone (i.e., the vertebrae).Some users may consider tills to be obJectlonable, because of discoloration of the bone surfaces, and the expedient shown in Figures 4 to 6 may be resorted to in order to overcome the smearing tendency.In the. blade 25 of Figures 4 to 6 the back portion 26 has a uniform thickness like the portion 11 in Figures 1 to 3, but the tapered portion 27 is hollow ground, on a long radius 28 (e.g., about six feet) centered at a point 29 above the base of the teeth (e.g., one inch above). This creates a zone 30 adjacent the cutting edge and extending upwardly therefrom, where the blade has a varying reduced thickness, which may be from .002" to .008" (maximun at 31) less than the thickness at the points of the teeth. It has been found that this blade cuts more easily and cleaner than the single tapered blade of Figures 1 to 3, and eliminates the smearing of the bone, while retaining the ability to stand rapid reciprocation (2200 R.P.M.) with a strong rigid back portion and teeth having a cutting thickness of only .05" to .06".The root portions of the teeth are shown as being modified by bevel grinding (as with a .25' cutter) each side of the blade at its root, as shown at 32, and the tooth working faces may be joined by a curve 33 instead of meeting at a sharp corner.While a knife blade severs a mass by "disconnecting" its parts along the blade edge and push- ing the parts aside, the teeth of a saw act to remove and discard all the material of the mass in their path. The tapered saw blades described above have a cutting tooth edge which is thinner by about one-third than the cutting tooth edge of the previously used flat blade, so that it removes less material, i.e., wastes less, while requiring less power to cut through a given distance. The thicker back portions 11 or 26 give the blade substantially greater rigidity so that flexing is minimized and the narrowness of the teeth (which move through the material easier than wider teeth would) contributes to the reduction in flexing. The bone and meat through which the blade is designed to cut, separate as the cutting progresses without causing the blade to bind.WHAT WE CLAIM IS: 1. A straight saw blade adapted for reciprocation without tension in a carcass splitting saw, comprising a back portion having a back edge and an integral transversely tapering portion integral with the back portion and having a cutting edge parallel to the back edge, the back portion having a substantially uniform thickness, the tapering portion having its greatest thickness at its line ofjunction with the back portion and being hollow ground with its least thickness along a line spaced from its cutting edge, saw teeth being formed in said cutting edge, each said tooth being adapted to remove a portion of the material being sawn, and the width of the back portion, i.e. the distance from the back edge to the junction, being no greater than half of the distance from the back edge to the base of the teeth.
- 2. A saw blade according to claim 1 wherein said line of least thickness is spaced from the base of the teeth by a distance of about onethird of the width of the blade, i.e. the distance from the back edge to the cutting edge.
- 3. A saw blade according to claim 2 wherem the root portions of the teeth are bevel ground, the tooth working faces being joined by a curved portion.
- 4. A saw blade substantially as herein described with reference to Figures 4. 5 or 6 of the accompanying drawings.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US05/658,282 US4027390A (en) | 1974-11-01 | 1976-02-17 | Saw blade |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1573122A true GB1573122A (en) | 1980-08-13 |
Family
ID=24640613
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB6690/77A Expired GB1573122A (en) | 1976-02-17 | 1977-02-17 | Saw blade |
Country Status (10)
Country | Link |
---|---|
AR (1) | AR210386A1 (en) |
AU (1) | AU2106077A (en) |
BR (1) | BR7700665A (en) |
CA (1) | CA1046906A (en) |
DE (1) | DE2702239A1 (en) |
FR (1) | FR2341413A1 (en) |
GB (1) | GB1573122A (en) |
IT (1) | IT1083173B (en) |
NZ (1) | NZ183022A (en) |
ZA (1) | ZA77618B (en) |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2692621A (en) * | 1948-08-18 | 1954-10-26 | Ezekiel C Steiner | Carcass splitting saw |
US2596851A (en) * | 1950-02-27 | 1952-05-13 | Hansen John | Cutter blade |
US3001287A (en) * | 1958-05-26 | 1961-09-26 | Ford Motor Co | Vinyl stock cutting blade |
GB1047941A (en) * | 1963-02-26 | 1966-11-09 | John Dirk Bruere | Improvements in or relating to blade saws |
-
1977
- 1977-01-05 AU AU21060/77A patent/AU2106077A/en not_active Expired
- 1977-01-06 NZ NZ183022A patent/NZ183022A/en unknown
- 1977-01-17 CA CA269,822A patent/CA1046906A/en not_active Expired
- 1977-01-20 DE DE19772702239 patent/DE2702239A1/en not_active Withdrawn
- 1977-01-25 AR AR266301A patent/AR210386A1/en active
- 1977-02-03 ZA ZA770618A patent/ZA77618B/en unknown
- 1977-02-03 BR BR7700665A patent/BR7700665A/en unknown
- 1977-02-15 FR FR7704256A patent/FR2341413A1/en not_active Withdrawn
- 1977-02-16 IT IT48062/77A patent/IT1083173B/en active
- 1977-02-17 GB GB6690/77A patent/GB1573122A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
FR2341413A1 (en) | 1977-09-16 |
AR210386A1 (en) | 1977-07-29 |
BR7700665A (en) | 1977-10-11 |
IT1083173B (en) | 1985-05-21 |
CA1046906A (en) | 1979-01-23 |
NZ183022A (en) | 1978-09-20 |
AU2106077A (en) | 1978-07-13 |
ZA77618B (en) | 1977-12-28 |
DE2702239A1 (en) | 1977-08-18 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |